Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Statement Of Stockholders Equity [Abstract]
Common stock dividends declared (per share)	$ 0.04	$ 0.04	$ 0.04	$ 0.03	$ 0.03	$ 0.03
ESOP shares committed to be released (in shares)	24,154	24,419	24,419	23,092	24,419	24,419